pivconnection.swift

func doSomething() {

  connection { connection in
        self.log(message: "Connection: \(connection.description)")

        guard let smartCard = connection.smartCardInterface else {
            self.log(error: "Failed to get smart card interface.")
            return
        }

        // 1. Select PIV application (Slot 9c)
        let selectPIVAPDU = YKFSelectApplicationAPDU(data: Data([0xA0, 0x00, 0x00, 0x03, 0x08]))!
        smartCard.selectApplication(selectPIVAPDU) { response, error in
            guard error == nil else {
                self.log(error: error!)
                return
            }

            // 2. Verify against the PIV application from the key (PIN is default 123456).
            let verifyApdu = YKFAPDU(data: Data([0x00, 0x20, 0x00, 0x80, 0x08, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0xff, 0xff]))!

            smartCard.executeCommand(verifyApdu) { response, error in
                guard error == nil else {
                    self.log(error: error!)
                    return
                }
                self.log(message: "PIN verification successful.")

                // 3. Read the certificate stored on the PIV application in slot 9C.
                let readApdu = YKFAPDU(data: Data([0x00, 0xCB, 0x3F, 0xFF, 0x05, 0x5C, 0x03, 0x5F, 0xC1, 0x0A]))!
                smartCard.executeCommand(readApdu) { data, error in

                    certData = data

                    if #available(iOS 13.0, *) {
                        YubiKitManager.shared.stopNFCConnection()
                    }

                    // Get the SecCertificate
                    let certUtil = CertificateUtil()
                    DispatchQueue.main.async {
                        let cert = certUtil.createSecCertificateFromData(data: certData!)
                        if let cert = cert {
                            self.certificates.append(cert)
                            print("Successfully found certificate: \(cert.subjectAlt)")
                        }
                    }
                } // End smartcard.executeCommand #2
            } // End smartcard.executeCommand #1
        } // End smartCard.selectApplication
    } // End YubiKey CONNECTION
}